Stovepipe elbow



Jan. 1, 1946. w BRUHN AL 2,392,220 Q STOVE PIPE ELBOW Filed June 26, 1945 2 Sheets-Sheet l STOVE PIPE ELBOW Filed June 26, 1943 2 Sheets-Sheet 2 I g (Ittomeg Patented Jan. 1, 1946 UNITED- STATES. PATENT OFFICE 2392,220

Y STOVE-PIPE'ELBOW wiuiamjri Bruhii and Richard W. Simon, Omaha, Nebr. ApplioationiJune;.26, 194s, 'Seria1:No-492;404*

v z olaiims.

Thepresent invention relates to conduit "and elbows; more particularly Y to i tubularsections thereof "which are adapted -to be joined together end to end for "providing a continuousconduit having an elbow;

Iti's an object *of'the inventionto provide anew article of manufacture comprisinga tubular' elbow formed preferably of processed sheet metal; the parts of. which are so constructed and arranged that" said article may be readilyand tlireade'dly attachedone one or more tubular" conduit sections such-as or similartto that article depicted'and de scribed in: our."co pendingzapplicationzforpatent;

Serial "No; 1177-356; filedLiu the United Sta'tes -Pat ent Ofiice Eebruary 2'1; 1943.

It isi alsoranaobjctaofzthexinventlon to provide elbow pieces; which may 'be" nested: compactly one about another: andzjoined; togetherin as. package at. a centralized factory for. transportation: and distribution to; ultimate users; and? to provide means on saids pieces-such 1thatzaniunskilled user may; readily form said; pieces: into accurate finished elbow sections'andan-elbow;

Another, object of:- thersinventioni isv'to' provide elbow sections .sorconstructed; that: they may: be readily adjusted; to-*form. any): desired degrees of bend; to; the :right: or; leftof azconduit; saida con struction ;beingsuch:that thezjoints :thereottare tight for preventing gas-.leaks-therethrough when adjusted tda position-'of use;

Still another: object: of theeinvention iSitOEprO lvide elbowpieces-ywith holes'xforreceiVingE'riK etS therethrough, said holesbeing disposed adjacent theends of each sectionso-that at the'ftim'e a user disposes rivets through 'aligneda holes i and: said: rivetszarezpeened, trueelbow sections ;are;provided:

bysaid pieces of.-pre'-.selected size-.andzdiameter;

vidl straight conduits. sectionse= havirigz-z annular stops arrangedtoabutand engage withlthezan nularends ofthe outer ends of 'the end sections of the elbow of the present invention .for'vprovid ing airtightdoints:

Other and further obiects'fand advantages of the invention? will abezohvious' to -those skilled'in the art.

' In the drawings: i

Figure 1 is aside view-of theinew-elbow having a ibrokem away straight pipersection's: secureaa-to eachrendth'ereofs Figure 2 is a side view of the reverse sideiofth'e elbow shown in Figured; certain porti'ons of? the ends of said elbow being broken away; Figure 3 isia side "view. of an end 'sectionoi the elbow shown in Figure-l. A

Figure '4: issa :sideT-view; as shown :in FEW-m2; of: an elbow section provided. with :femalg-threads:

Figure 5 is a side view, as shown in- Figure- 1; of an elbow section'provided with male threads;

Figure 6 is =a-sideiview, as shown in "Figure 2, or the other end section of the elbowof'thepresent invention,- ,a certain portion thereof being. broken away;

Figure 7 ;is a transverse section takenbetween the2lines:|.- 1 ofFigure-Z. v I

- Figure-.8 is;a=longitudinal section of azfrag-ment Of the'E elbow; .t-hewvieW-being taken: along.-.the- -line 8--8 of Figure-7.,

t Figure is aside-view of a-straight pipesection having: a :portion intermediate its ends broken away. and showing=anend .sectionsof 'theelbow joined thereto Y Figure .10 is asideviewof the pieces of theelbow of:the2present invention nested in a package prior to being formed into elbowsections; g g I Figure-ll is-an end view of the package oi pieces shown in Figure 10. g g I M It is well known to -the sheet metal art that partially fabricated sheet metal goods, if nested together in. a package; are entitled to and receive a much lower. freight rate-than in instances where aniarticle is ."completeh assembled, and the;presentinvention therefore aims. to 1 provide elbow pieces :which arerso constructed that theym ay. be packagedztogether acompact-rnanner, utilizing pre-formedwrivet hole nfor said purposeand to also obviate certain other undesirable ieaturesof the prior practice;

The-elbow of the-present invention I includes a plurality: of sections; and as specifically. illustrat ed in: Figure 1 the elbow includes f our P sections,-

respectively: indicated at my, l2-and 13; each being; formed of an integral piece of; material. Ashbestshown in Figures, the sectiondD is-pro vided with an annular end I4 disposed at a true right angle with respect to the axis thereof. The

section I is rolled or bent to a substantially circular configuration in end elevation and proscribed in our said co-pending application, and an outstanding detent rib I9 is similarly provided, said rib being disposed at a true right angle! with respect to the longitudinal length or axis. of the.

the plain end 30 of the section I3 becomes abutted against the inwardly disposeddetent 34 of the section 32 for joining the pipe section 32 and the end elbow section I3 together in a manner whereby an airtight joint is provided.

As shown in Figure 1, the end section I!) of 'the elbow is similarly joined, for said purposes.

to the wider end of a further straight pipe section 39 for providing a, conduit having an elbow.

The straight pipe sections 32 and 39 may be nested together for compact shipment as described in our said copending application.

sectionand parallel to the edge I4. The end of a the elbow pieces are each provided with a plu- 'i v'rality ofrivetrholes 40 for receiving the rivets I1 the section II] oppositeits end edge I4 is 'pro-' vided with a female thread }fasshown. in Fig? ure 8; V a j r The section II, as shown in Figure 5, is provided with' ofi'set. oppositely disposed; male 7 threads 2| and 22 atitsends; vAs bestshown in Figure 8, the threads 2|. and 22, are bent upon themselves for providing seamed threadsiwhere-,

by the perimete'rs thereof are smooth andstrong,

for purposeslater described, said thread 2] be-' ing received into the female thread 23 of the section I0 during use. The section II is provided with an underlapping. tab portion 23; whereby further rivets iII may be employed for providing a section which is of true circular contour inrend elevation. s 1. 1

The section I2-is similarly provided with..further rivets 'I'I jior securingits tab 24 for providing a circular section and is provided with oppositely disposed femalethreads 25 and 26 at its ends? In use, the male thread 22 of thesec- .tion Il is received within the female thread 25 of the section I2.

V The section I3 is also provided with a'tab portion 21 and further rivets IT for joining adjacent ends thereof togetherin atrue-circular configuration. The end section I3 is similarly provided with an outstanding annular detento'r rib 28 and a helically disposed male thread 29 :between its smooth end 30 and' th'e detent 28. The

other end of the section; I3 is provided with av helical male thread 3| 'whichis similar'to the threads 22 and 2l of the section II.

Referring to Figure '9, astraight pipe section 32 of thepresentinvention is provided adjacent one end thereof with an outstanding rib or lug detent 33, and a similar but inwardly disposed detent'34 adjacent its opposite end. The straight pipe section 32ma'y be of any desired length The package of the elbow pieces of the present I invention is illustrated in Figures 10 and 11.

Asshown in Figure 10, it will be understood that the tab portions and adjacent end portions of for providing elbow sections as above described- Since the rivet holes are all disposed accurately in a.pre selected position certain holes of. the pieces, and particularly. the holes of thetab portions thereof, may be readily aligned as shown in Figures 11 and, 12. ,To'provide thepackage of the present invention the end elbow; Section Figure I10. and rivet holes of thetabs of the having opposite plain ends 35 and 36 which'- are disposed at'a true-right angle with respect to the length thereof. Between the end 35 and the detent 33 a helical outstanding'male thread 31 is'provided. Between the detent 34 and the end 36 a'helical female thread 38 is provided. One

7 end of the pipe 32 is of slightly less diameter than its other end, wherebyits end '36 isadapted to receive,- threadedly, the small end ofanother and' similarstraight pipe section,-the thread 38 of said oth'er section'engaging the thread 31 of the section 32, for providing a conduit or a -de-' sired length. 7

As shown in Figure 9, the section I3 of the el' bow is joined to the straight pipe 32 by means of rotating the male thread 29 of the elbow section 13' into and in engagement with the female thread 38 of the section 32 until the end 36 of the sectlon-32 becomes abutted'against theannula'r detent 28 of the elbow section I3 and until sections are thendisposed in alignment with each other for receiving a suitable keeper therethrough. Preferably, the keeper is providedby means of a screw.4l disposed throughthe aligned holes'of the elbow sections, asbest shown in Figure 11; the thrads ofthe screw"!!! engaging thewalls of the aligned holes 40 for providing the package .of elbow pieces held together for shipment in a manner ,;whereby' the weaker portions thereof, namely,' the7mal'e threads 2I ;;22'

and SI, are protected; thisbeing desirabla fsince the male threads are maintained; smooth for facilitating .a joining "ofthe; elbowsections to-;

gether, as above described." a g operation, the package of elbow pieces being assembled for shipment at'a factory, upon' arrival in .the hands of an ultimate user he may readily .removeithe keeper 4| anddi'senagage'the' pieces II], II, I2 and I3 from"one another, whereupon he applies the rivets I! to the rivet holes 4010f the respective pieces for providing elbow sections. Since 'the "rive't holes are a'ccu'rately formed at" the factory'ins'uch'position' that at the time the. end tabs of the 'pieces'iar'e' disposed under :adjacent longitudinal ends or the sec tions, the holes of said end tabs ande'nds align accurately for receiving the rivets through said aligned holes and in this manner "elbow sections thereby. become formed of a pr'e-sel ected size and true shape, whereby they maybe readily at tached' one to another forprovidin'g an elbow;

The keeper 4! may be omitted in instances where the elbow-pieces are properly nestedfto gether, as above described, since theinterfitting threads of the pieces are sumeiemf rei holding the-pieces together 'in' a lciacl ia'geand in instarices where the material of said pieces is of sufliciently stifi gauge to provide a clamping action when one piece is disposed about another.

Among other advantages of the invention it will be noted that the several sections, when attached together as above described, will not pull apart during use as often has happened heretofore when conduits are employed for smoke pipes, and that tight joints are formed whereby noxious gases and the like are confined in the conduit.

At times when the elbow pieces are formed of certain of the modern non-inflammablel plastics or of sheet metal, said material has sufiicient inherent resiliency to cause one elbow piece to clamp and grip a next adjacent piece when said pieces are assembled in the above described package, since said resiliency normally urges the free ends of each of the arcuate pieces toward each other.

From the foregoing description it is thought to be obvious that a conduit which includes an elbow constructed in accordance with our invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that our invention is susceptible of some'change and modification without departing from the principles and spirit thereof.

We claim:

1. In a tubular conduit elbow, a plurality of sections threadedly joined together, and a helical screw thread disposed on the outer end of each of the end sections arranged to engage complemental screw threads of straight tubular sections.

2. A tubular conduit comprising a plurality of elbow sections threadedly joined together for providing an elbow, an annular detent adjacent the end of each end section, said detents each being disposed at a right angle with respect to the axis of and on the perimeter of said end sections, a helical thread provided on each end sectiOn between said detents and said ends, and straight sections each having complemental threads for a joinder thereof to respective end sections of theelbow, whereby the ends of the straight sections abut their respective detents.

. WILLIAM J. BRUHN. RICHARD W. SIMON. 

